Breakpoint inside of test function doesn't work

Hello. I've set up docker/docker-compose and everything is working well so far except for one thing. When I'm trying to debug my test function, the breakpoint doesn't stop inside of test function. The breakpoint on the screenshot doesn't stop when I run in debug mode:

However, if I try to run the same test function in debug mode and put a breakpoint inside of create_picture function, it stops:

What is happening? How to get the breakpoint inside of the test function (test_create_picture) working?